WO2020032675A1 - Procédé et appareil d'émission ou de réception de données dans une bande sans licence - Google Patents

Procédé et appareil d'émission ou de réception de données dans une bande sans licence Download PDF

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Publication number
WO2020032675A1
WO2020032675A1 PCT/KR2019/010061 KR2019010061W WO2020032675A1 WO 2020032675 A1 WO2020032675 A1 WO 2020032675A1 KR 2019010061 W KR2019010061 W KR 2019010061W WO 2020032675 A1 WO2020032675 A1 WO 2020032675A1
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WIPO (PCT)
Prior art keywords
subband
lbt
uplink data
information
terminal
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PCT/KR2019/010061
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English (en)
Korean (ko)
Inventor
박규진
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KT Corp
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KT Corp
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Priority claimed from KR1020190096457A external-priority patent/KR102408453B1/ko
Application filed by KT Corp filed Critical KT Corp
Priority to US17/051,611 priority Critical patent/US11445542B2/en
Priority to CN201980029295.6A priority patent/CN112088561B/zh
Priority to EP19847867.9A priority patent/EP3836708B1/fr
Publication of WO2020032675A1 publication Critical patent/WO2020032675A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0457—Variable allocation of band or rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]

Definitions

  • the present embodiments propose a method and apparatus for transmitting and receiving data in an unlicensed band in a next generation wireless access network (hereinafter referred to as "NR").
  • NR next generation wireless access network
  • 3GPP recently approved a study item "Study on New Radio Access Technology” for the study of next-generation radio access technology (that is, 5G radio access technology). Designs for frame structures, channel coding & modulation, waveforms and multiple access schemes are in progress.
  • the NR is required to be designed to satisfy various QoS requirements required for each detailed and detailed usage scenario as well as improved data rate compared to LTE.
  • enhancement mobile broadband eMBB
  • massive machine type communication MMTC
  • ultra reliable and low latency communications URLLC
  • Each service scenario has different requirements for data rates, latency, reliability, coverage, and so on, through the frequency bands that make up any NR system.
  • As a method for efficiently satisfying the needs of each usage scenario based on different numerology (for example, subcarrier spacing, subframe, transmission time interval, etc.) There is a need for a method of efficiently multiplexing radio resource units of a network.
  • Embodiments of the present disclosure provide a method and apparatus for transmitting and receiving uplink data and downlink data based on LBT results for one or more subbands for a system bandwidth of a cell configured in a bandwidth part or an unlicensed band in an unlicensed band. Can be provided.
  • the present embodiment is a method for transmitting uplink data in the unlicensed band, the terminal, the configuration information of one or more subbands for the bandwidth part configured in the unlicensed band or the system bandwidth of the cell configured in the unlicensed band Receiving, downlink control information including uplink frequency domain resource allocation information for uplink data transmission in a bandwidth part or system bandwidth, based on the resource allocation information, allocated for uplink data transmission Performing an LBT operation on each subband to which a frequency resource belongs, determining a subband for transmitting uplink data based on a result of the LBT operation, and transmitting the uplink data in the determined subband; It can provide a method to include.
  • embodiments of the present invention provide a method for a base station to receive uplink data in an unlicensed band, comprising: configuring at least one subband for a bandwidth part configured in an unlicensed band or a system bandwidth of a cell configured in an unlicensed band to a terminal. Transmitting information, transmitting downlink control information including uplink scheduling information for one or more subbands, and performing LBT operation by the UE for each of at least one subband within a bandwidth part or system bandwidth
  • a method may include receiving uplink data in a subband determined based on a result.
  • the present embodiment in the terminal for transmitting uplink data in the unlicensed band,
  • a terminal may include a controller configured to determine a subband for transmitting link data and a transmitter configured to transmit uplink data in the determined subband.
  • the present embodiments in the base station receiving uplink data in an unlicensed band, configuration information of one or more subbands for a bandwidth part configured in an unlicensed band or a system bandwidth of a cell configured in an unlicensed band to a terminal
  • a LBT operation is performed by the UE for each of at least one subband within a transmitter and a bandwidth part or a system bandwidth for transmitting a DL and downlink control information including uplink scheduling information for one or more subbands. It is possible to provide a base station including a receiver for receiving uplink data in the subband determined based on.
  • the embodiments of the present invention provide a method for a user equipment to receive downlink data in an unlicensed band, which includes a bandwidth part configured in an unlicensed band or one or more subbands for a system bandwidth of a cell configured in an unlicensed band from a base station.
  • Receiving configuration information receiving downlink control information including subband indication information determined for downlink data transmission based on a result of performing LBT for each subband of one or more subbands; It may provide a method comprising the step of receiving downlink data in the band.
  • the present embodiments provide a method for transmitting downlink data in an unlicensed band by a base station, and includes one or more subbands for the system bandwidth of a cell configured in an unlicensed band or a bandwidth part configured in an unlicensed band to a terminal. Transmitting configuration information, performing an LBT operation on each of the one or more subbands, determining a subband for transmitting downlink data based on the result of the LBT operation, and including indication information on the determined subbands The method may include transmitting downlink control information and transmitting downlink data in the determined subband.
  • the embodiments of the present invention in a terminal receiving downlink data in an unlicensed band, configuration information of one or more subbands for a bandwidth part configured in an unlicensed band from a base station or a system bandwidth of a cell configured in an unlicensed band And receive downlink control information including subband indication information determined for downlink data transmission based on the result of performing LBT for each subband of one or more subbands, and receive the downlink in the determined subbands.
  • a terminal including a receiver for receiving data and a controller for controlling an operation of the receiver may be provided.
  • the present embodiments in the base station transmitting downlink data in the unlicensed band, configuration information of one or more subbands for the bandwidth part configured in the unlicensed band or the system bandwidth of the cell configured in the unlicensed band to the terminal
  • a control unit configured to perform an LBT operation on each of the transmitter and the one or more subbands, and to determine a subband for transmitting downlink data based on the result of the LBT operation, and the transmitter comprises:
  • the base station may transmit downlink control information including the indication information and transmit downlink data in the determined subband.
  • a method and apparatus for transmitting and receiving uplink data and downlink data based on LBT results of a plurality of subbands for a system bandwidth of a cell configured in a bandwidth part or an unlicensed band in an unlicensed band Can be provided.
  • FIG. 1 is a diagram schematically illustrating a structure of an NR wireless communication system to which an embodiment of the present invention may be applied.
  • FIG. 2 is a view for explaining a frame structure in an NR system to which the present embodiment can be applied.
  • FIG. 3 is a diagram for describing a resource grid supported by a radio access technology to which an embodiment of the present invention can be applied.
  • FIG. 4 is a diagram for describing a bandwidth part supported by a radio access technology to which an embodiment of the present invention can be applied.
  • FIG. 5 is a diagram exemplarily illustrating a synchronization signal block in a radio access technology to which the present embodiment can be applied.
  • FIG. 6 is a diagram for explaining a random access procedure in a radio access technology to which the present embodiment can be applied.
  • FIG. 8 is a diagram illustrating an example of symbol level alignment among different SCSs in different SCSs to which the present embodiment can be applied.
  • FIG. 9 is a diagram illustrating a conceptual example of a bandwidth part to which the present embodiment can be applied.
  • FIG. 10 is a diagram illustrating a procedure for transmitting uplink data in an unlicensed band by a terminal according to an embodiment.
  • 11 is a diagram illustrating a procedure of receiving uplink data in an unlicensed band by a base station according to an embodiment.
  • FIG 12 illustrates an example of performing LBT for wireless communication in an unlicensed band according to an embodiment.
  • FIG. 13 is a diagram illustrating a configuration of a sub-band for a bandwidth part configured in a terminal according to an embodiment.
  • FIG. 14 is a diagram illustrating a procedure of receiving downlink data in an unlicensed band by a terminal according to an embodiment.
  • 15 is a diagram illustrating a procedure for transmitting downlink data in an unlicensed band by a base station according to an embodiment.
  • 16 is a diagram illustrating a configuration of a user terminal according to another embodiment.
  • 17 is a diagram illustrating a configuration of a base station according to another embodiment.
  • first, second, A, B, (a), and (b) may be used. These terms are only to distinguish the components from other components, and the terms are not limited in nature, order, order or number of the components.
  • temporal flow relations with respect to the components, the operation method, the fabrication method, and the like, for example, the temporal relationship between the temporal relationship of " after “, “ following “, “ after “, “ before “ Or where flow-benefit relationships are described, they may also include cases where they are not continuous unless “right” or "direct” is used.
  • the numerical values or corresponding information may be various factors (e.g., process factors, internal or external shocks, It may be interpreted as including an error range that may be caused by noise).
  • the wireless communication system in the present specification means a system for providing various communication services such as voice and data packets using radio resources, and may include a terminal, a base station, or a core network.
  • the embodiments disclosed below can be applied to a wireless communication system using various radio access technologies.
  • the embodiments of the present invention may include code division multiple access (CDMA), frequency division multiple access (FDMA), timedivision multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), and single carrier frequency division multiple access (SC-FDMA).
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA timedivision multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • the wireless access technology may mean not only a specific access technology but also a communication technology for each generation established by various communication consultation organizations such as 3GPP, 3GPP2, WiFi, Bluetooth, IEEE, and ITU.
  • CDMA may be implemented with a radio technology such as universal terrestrial radio access (UTRA) or CDMA2000.
  • TDMA may be implemented in a radio technology such as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE).
  • OFDMA may be implemented in wireless technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA), and the like.
  • IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e.
  • UTRA is part of a universal mobile telecommunications system (UMTS).
  • 3rd generation partnership project (3GPP) long term evolution (LTE) is part of evolved UMTS (E-UMTS) using evolved-UMTS terrestrial radio access (E-UTRA), employing OFDMA in downlink and SC- in uplink FDMA is adopted.
  • 3GPP 3rd generation partnership project
  • LTE long term evolution
  • E-UMTS evolved-UMTS terrestrial radio access
  • OFDMA OFDMA in downlink
  • SC- in uplink FDMA is adopted.
  • the embodiments may be applied to a wireless access technology that is currently disclosed or commercialized, and may be applied to a wireless access technology that is currently under development or will be developed in the future.
  • the terminal in the present specification is a comprehensive concept of a device including a wireless communication module for performing communication with a base station in a wireless communication system, and in WCDMA, LTE, NR, HSPA, and IMT-2020 (5G or New Radio), etc.
  • UE user equipment
  • MS Mobile Station
  • UT User Interface
  • SS Subscriber Station
  • the terminal may be a user portable device such as a smart phone according to a usage form, and in the V2X communication system, it may mean a vehicle, a device including a wireless communication module in the vehicle, and the like.
  • a machine type communication system it may mean an MTC terminal, an M2M terminal, a URLLC terminal, etc. equipped with a communication module to perform machine type communication.
  • a base station or a cell of the present specification refers to an end point that communicates with a terminal in terms of a network, and includes a Node-B, an evolved Node-B, an eNB, a gNode-B, a Low Power Node, and an LPN. Sector, site, various types of antenna, base transceiver system (BTS), access point, point (for example, transmission point, reception point, transmission / reception point), relay node ), A mega cell, a macro cell, a micro cell, a pico cell, a femto cell, a remote radio head (RRH), a radio unit (RU), and a small cell.
  • the cell may mean a bandwidth part (BWP) in the frequency domain.
  • the serving cell may mean an activation BWP of the terminal.
  • the base station may be interpreted in two meanings. 1) the device providing the mega cell, the macro cell, the micro cell, the pico cell, the femto cell, the small cell in relation to the radio area, or 2) the radio area itself. In 1) all devices that provide a given wireless area are controlled by the same entity or interact with each other to cooperatively configure the wireless area to the base station. According to the configuration of the wireless area, a point, a transmission point, a transmission point, a reception point, and the like become one embodiment of a base station. In 2), the base station may indicate the radio area itself that receives or transmits a signal from the viewpoint of the user terminal or the position of a neighboring base station.
  • a cell refers to a component carrier having coverage of a signal transmitted from a transmission / reception point or a signal transmitted from a transmission point or a transmission / reception point, and the transmission / reception point itself. Can be.
  • Uplink means a method for transmitting and receiving data to the base station by the terminal
  • downlink Downlink (Downlink, DL, or downlink) means a method for transmitting and receiving data to the terminal by the base station do.
  • Downlink may mean a communication or communication path from the multiple transmission and reception points to the terminal
  • uplink may mean a communication or communication path from the terminal to the multiple transmission and reception points.
  • the transmitter in the downlink, the transmitter may be part of multiple transmission / reception points, and the receiver may be part of the terminal.
  • uplink a transmitter may be part of a terminal, and a receiver may be part of multiple transmission / reception points.
  • the uplink and the downlink transmit and receive control information through a control channel such as a physical downlink control channel (PDCCH), a physical uplink control channel (PUCCH), a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), and the like.
  • a control channel such as a physical downlink control channel (PDCCH), a physical uplink control channel (PUCCH), a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), and the like.
  • a control channel such as a physical downlink control channel (PDCCH), a physical uplink control channel (PUCCH), a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), and the like.
  • 3GPP After researching 4G (4th-Generation) communication technology, 3GPP develops 5G (5th-Generation) communication technology to meet the requirements of ITU-R's next generation wireless access technology. Specifically, 3GPP develops a new NR communication technology separate from LTE-A pro and 4G communication technology, which is an enhancement of LTE-Advanced technology to the requirements of ITU-R with 5G communication technology. Both LTE-A pro and NR mean 5G communication technology.
  • 5G communication technology will be described based on NR when a specific communication technology is not specified.
  • Operational scenarios in NR defined various operational scenarios by adding considerations to satellites, automobiles, and new verticals in the existing 4G LTE scenarios, and in terms of services, have an eMBB (Enhanced Mobile Broadband) scenario and high terminal density.
  • eMBB Enhanced Mobile Broadband
  • MMTC mass machine communication
  • URLLC Ultra Reliability and Low Latency
  • NR discloses a wireless communication system using a new waveform and frame structure technology, low latency technology, mmWave support technology, and forward compatible technology.
  • the NR system proposes various technological changes in terms of flexibility to provide forward compatibility. The main technical features of the NR will be described with reference to the drawings below.
  • FIG. 1 is a diagram briefly showing a structure of an NR system to which the present embodiment may be applied.
  • an NR system is divided into a 5G core network (5GC) and an NR-RAN part, and the NG-RAN controls a user plane (SDAP / PDCP / RLC / MAC / PHY) and a user equipment (UE).
  • SDAP user plane
  • PDCP user plane
  • RLC user equipment
  • UE user equipment
  • gNB gNB and ng-eNBs that provide planar (RRC) protocol termination.
  • the gNB interconnects or gNBs and ng-eNBs are interconnected via an Xn interface.
  • gNB and ng-eNB are each connected to 5GC through the NG interface.
  • the 5GC may be configured to include an access and mobility management function (AMF) for controlling a control plane such as a terminal access and mobility control function, and a user plane function (UPF) for controlling a user data.
  • AMF access and mobility management function
  • UPF user plane function
  • NR includes support for sub-6 GHz frequency bands (FR1, Frequency Range 1) and 6 GHz and higher frequency bands (FR2, Frequency Range 2).
  • gNB means a base station that provides NR user plane and control plane protocol termination to the terminal
  • ng-eNB means a base station that provides E-UTRA user plane and control plane protocol termination to the terminal.
  • the base station described in the present specification should be understood to mean gNB and ng-eNB, and may be used to mean gNB or ng-eNB separately.
  • a CP-OFDM waveform using a cyclic prefix is used for downlink transmission, and a CP-OFDM or DFT-s-OFDM is used for uplink transmission.
  • OFDM technology is easy to combine with Multiple Input Multiple Output (MIMO), and has the advantage of using a low complexity receiver with high frequency efficiency.
  • MIMO Multiple Input Multiple Output
  • the NR transmission neuron is determined based on sub-carrier spacing and cyclic prefix (CP), and ⁇ is used as an exponent value of 2 based on 15 kHz as shown in Table 1 below. Is changed to.
  • CP sub-carrier spacing and cyclic prefix
  • the NR's neuronality may be classified into five types according to the subcarrier spacing. This is different from the LTE subcarrier spacing, which is one of the 4G communication technologies, fixed at 15 kHz. Specifically, the subcarrier intervals used for data transmission in NR are 15, 30, 60, and 120 kHz, and the subcarrier intervals used for synchronization signal transmission are 15, 30, 12, and 240 kHz. In addition, the extended CP applies only to 60 kHz subcarrier intervals.
  • the frame structure (frame) in NR is a frame having a length of 10ms consisting of 10 subframes having the same length of 1ms is defined.
  • One frame may be divided into half frames of 5 ms, and each half frame includes five subframes.
  • one subframe consists of one slot and each slot consists of 14 OFDM symbols.
  • 2 is a view for explaining a frame structure in an NR system to which the present embodiment can be applied.
  • the slot is fixedly configured with 14 OFDM symbols in the case of a normal CP, but the length of the slot may vary according to the subcarrier spacing.
  • the slot is configured to be 1 ms long and the same length as the subframe.
  • the slot is composed of 14 OFDM symbols, but two slots may be included in one subframe with a length of 0.5 ms. That is, the subframe and the frame are defined with a fixed time length, the slot is defined by the number of symbols, the time length may vary according to the subcarrier interval.
  • NR defines a basic unit of scheduling as a slot and also introduces a mini slot (or subslot or non-slot based schedule) to reduce transmission delay of a radio section.
  • the use of a wide subcarrier spacing shortens the length of one slot inversely, thus reducing the transmission delay in the radio section.
  • the mini slot (or sub slot) is for efficient support for the URLLC scenario and can be scheduled in units of 2, 4, and 7 symbols.
  • NR defines uplink and downlink resource allocation at a symbol level in one slot.
  • a slot structure capable of transmitting HARQ ACK / NACK directly within a transmission slot has been defined, and this slot structure will be described as a self-contained structure.
  • NR is designed to support a total of 256 slot formats, of which 62 slot formats are used in 3GPP Rel-15.
  • the combination of various slots supports a common frame structure constituting an FDD or TDD frame.
  • a slot structure in which all symbols of a slot are set to downlink a slot structure in which all symbols are set to uplink
  • a slot structure in which downlink symbol and uplink symbol are combined are supported.
  • NR also supports that data transmission is distributed and scheduled in one or more slots. Accordingly, the base station can inform the terminal whether the slot is a downlink slot, an uplink slot, or a flexible slot by using a slot format indicator (SFI).
  • SFI slot format indicator
  • the base station may indicate the slot format by indicating an index of a table configured through UE-specific RRC signaling using SFI, and may indicate the slot format dynamically through DCI (Downlink Control Information) or statically through RRC. It can also be indicated quasi-statically.
  • DCI Downlink Control Information
  • the antenna port is defined so that the channel on which the symbol is carried on the antenna port can be inferred from the channel on which another symbol on the same antenna port is carried. If the large-scale property of a channel on which a symbol on one antenna port is carried can be deduced from the channel on which the symbol on another antenna port is carried, then the two antenna ports are quasi co-located or QC / QCL. quasi co-location relationship.
  • the wide range characteristics include one or more of delay spread, Doppler spread, frequency shift, average received power, and received timing.
  • FIG. 3 is a diagram for describing a resource grid supported by a radio access technology to which an embodiment of the present invention can be applied.
  • a resource grid may exist according to each neuralology.
  • the resource grid may exist according to antenna ports, subcarrier spacing, and transmission direction.
  • the resource block consists of 12 subcarriers and is defined only in the frequency domain.
  • a resource element is composed of one OFDM symbol and one subcarrier. Accordingly, as shown in FIG. 3, one resource block may vary in size depending on the subcarrier spacing.
  • the NR defines "Point A" serving as a common reference point for the resource block grid, a common resource block, a virtual resource block, and the like.
  • FIG. 4 is a diagram for describing a bandwidth part supported by a radio access technology to which an embodiment of the present invention can be applied.
  • the UE designates a bandwidth part (BWP) within the carrier bandwidth.
  • BWP bandwidth part
  • the bandwidth part is associated with one neuralology and consists of a subset of consecutive common resource blocks, and can be dynamically activated over time.
  • the UE is configured with up to four bandwidth parts, respectively, for uplink and downlink, and data is transmitted and received using the bandwidth part activated at a given time.
  • uplink and downlink bandwidth parts are set independently, and in the case of unpaired spectrum, to prevent unnecessary frequency re-tunning between downlink and uplink operation.
  • the bandwidth parts of the downlink and the uplink are configured in pairs so as to share the center frequency.
  • the UE performs a cell search and random access procedure to access and communicate with a base station.
  • Cell search is a procedure in which a terminal synchronizes with a cell of a corresponding base station, acquires a physical layer cell ID, and obtains system information by using a synchronization signal block (SSB) transmitted by a base station.
  • SSB synchronization signal block
  • FIG. 5 is a diagram exemplarily illustrating a synchronization signal block in a radio access technology to which the present embodiment can be applied.
  • the SSB is composed of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), which occupy one symbol and 127 subcarriers, respectively, three OFDM symbols, and a PBCH spanning 240 subcarriers.
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • the terminal monitors the SSB in time and frequency domain and receives the SSB.
  • SSB can be transmitted up to 64 times in 5ms.
  • a plurality of SSBs are transmitted in different transmission beams within 5 ms time, and the UE performs detection assuming that the SSB is transmitted every 20 ms period based on a specific beam used for transmission.
  • the number of beams that can be used for SSB transmission within 5 ms time may increase as the frequency band increases.
  • up to 4 SSB beams can be transmitted at 3 GHz or less, and up to 8 different SSBs can be transmitted at a frequency band of 3 to 6 GHz, and up to 64 different beams at a frequency band of 6 GHz or more.
  • Two SSBs are included in one slot, and the start symbol and the number of repetitions in the slot are determined according to the subcarrier spacing.
  • the SSB is not transmitted at the center frequency of the carrier bandwidth, unlike the SS of the conventional LTE. That is, the SSB may be transmitted even where the center of the system band is not, and when supporting broadband operation, a plurality of SSBs may be transmitted in the frequency domain. Accordingly, the terminal monitors the SSB using a synchronization raster, which is a candidate frequency location for monitoring the SSB.
  • the carrier raster and the synchronization raster which are the center frequency position information of the channel for initial access, are newly defined in the NR, and the synchronization raster has a wider frequency interval than the carrier raster, and thus supports fast SSB search of the terminal. Can be.
  • the UE may acquire the MIB through the PBCH of the SSB.
  • the Master Information Block includes minimum information for the UE to receive the remaining system information (RMSI) that the network broadcasts.
  • the PBCH is information on the position of the first DM-RS symbol in the time domain, information for the UE to monitor SIB1 (for example, SIB1 neuronological information, information related to SIB1 CORESET, search space information, PDCCH Related parameter information, etc.), offset information between the common resource block and the SSB (the position of the absolute SSB in the carrier is transmitted through SIB1), and the like.
  • the SIB1 neuronal information is equally applied to some messages used in a random access procedure for accessing a base station after the terminal completes a cell search procedure.
  • the neuralology information of SIB1 may be applied to at least one of messages 1 to 4 for the random access procedure.
  • the aforementioned RMSI may refer to System Information Block 1 (SIB1), which is broadcast periodically (ex, 160ms) in the cell.
  • SIB1 includes information necessary for the UE to perform an initial random access procedure and is periodically transmitted through the PDSCH.
  • the UE needs to receive the information on the neuterology used for the SIB1 transmission and the control resource set (CORESET) information used for the scheduling of the SIB1 through the PBCH.
  • the UE checks scheduling information on SIB1 using SI-RNTI in CORESET and obtains SIB1 on PDSCH according to the scheduling information.
  • the remaining SIBs except for SIB1 may be periodically transmitted or may be transmitted at the request of the UE.
  • FIG. 6 is a diagram for explaining a random access procedure in a radio access technology to which the present embodiment can be applied.
  • the terminal transmits a random access preamble for random access to the base station.
  • the random access preamble is transmitted on the PRACH.
  • the random access preamble is transmitted to the base station through a PRACH composed of consecutive radio resources in a specific slot that is periodically repeated.
  • BFR beam failure recovery
  • the terminal receives a random access response to the transmitted random access preamble.
  • the random access response may include a random access preamble identifier (ID), an UL grant (uplink radio resource), a temporary C-RNTI (Temporary Cell-Radio Network Temporary Identifier), and a time alignment command (TAC). Since one random access response may include random access response information for one or more terminals, the random access preamble identifier may be included to indicate to which UE the included UL Grant, temporary C-RNTI, and TAC are valid.
  • the random access preamble identifier may be an identifier for the random access preamble received by the base station.
  • the TAC may be included as information for the UE to adjust uplink synchronization.
  • the random access response may be indicated by a random access identifier on the PDCCH, that is, a random access-radio network temporary identifier (RA-RNTI).
  • RA-RNTI random access-radio network temporary identifier
  • the terminal Upon receiving the valid random access response, the terminal processes the information included in the random access response and performs the scheduled transmission to the base station. For example, the terminal applies TAC and stores a temporary C-RNTI. In addition, by using the UL Grant, data or newly generated data stored in the buffer of the terminal is transmitted to the base station. In this case, information that can identify the terminal should be included.
  • the terminal receives a downlink message for contention resolution.
  • the downlink control channel in NR is transmitted in a control resource set (CORESET) having a length of 1 to 3 symbols, and transmits up / down scheduling information, slot format index (SFI), and transmit power control (TPC) information.
  • CORESET control resource set
  • SFI slot format index
  • TPC transmit power control
  • CORESET Control Resource Set
  • the terminal may decode the control channel candidate using one or more search spaces in the CORESET time-frequency resource.
  • a QCL (Quasi CoLocation) assumption is set for each CORESET, which is used to inform the analog beam direction in addition to delay spread, Doppler spread, Doppler shift, and average delay, which are assumed by conventional QCL.
  • CORESET may exist in various forms within a carrier bandwidth in one slot, and CORESET may be configured with up to three OFDM symbols in the time domain.
  • CORESET is defined as a multiple of six resource blocks up to the carrier bandwidth in the frequency domain.
  • the first CORESET is indicated through the MIB as part of the initial bandwidth part configuration to receive additional configuration information and system information from the network.
  • the terminal may receive and configure one or more CORESET information through RRC signaling.
  • NR New Radio
  • a bandwidth composed of a predetermined frequency section within a carrier bandwidth is described and described as a bandwidth part, a band whistle part, or a BWP, and the term is not limited thereto.
  • a bandwidth consisting of a predetermined frequency section in the bandwidth part is described as a subband, it is not limited to the term.
  • subband configuration information is an arbitrary term meaning information necessary for configuring a subband, and is not limited to the term, described in various terms that may indicate the same meaning.
  • LBT configuration information means the information necessary for the UE to perform the LBT, and as long as the term indicates the same meaning, there is no limitation thereof and may be used interchangeably.
  • LBT Listen Before Talk
  • 5G or NR technology which is a next generation wireless communication technology
  • Wifi various wireless communication technologies
  • the NR of 3GPP has been designed to satisfy various QoS requirements required by detailed and detailed service scenarios as well as improved data rate compared to LTE.
  • eMBB enhancement Mobile BroadBand
  • MMTC massive machine type communication
  • URLLC Ultra Reliable and Low Latency Communications
  • Each service scenario is a frequency constituting an arbitrary NR system because the requirements for data rates, latency, reliability, coverage, etc. are different from each other.
  • a radio resource unit based on different numerology (eg, subcarrier spacing, subframe, TTI, etc.) as a method for efficiently satisfying each service scenario needs through the band. It is designed to efficiently multiplex the.
  • TDM, FDM or TDM / FDM based on one or a plurality of NR component carriers (s) for numerology having different subcarrier spacing values.
  • a method of supporting multiplexing and a scheduling unit in a time domain a method of supporting one or more time units has been discussed.
  • a subframe is defined as a kind of time domain structure, and reference numerology is used to define a subframe duration.
  • reference numerology is used to define a subframe duration.
  • the LTE it was decided to define a single subframe duration consisting of 14 OFDM symbols of the same 15kHz sub-carrier spacing (SCS) -based normal CP overhead. Accordingly, the subframe in NR has a time duration of 1 ms.
  • SCS sub-carrier spacing
  • subframes of NR are absolute reference time durations
  • slots and mini-slots are time units based on actual uplink / downlink data scheduling.
  • any slot consists of 14 symbols, and according to the transmission direction of the slot, all symbols are used for DL transmission, or all symbols are UL transmission (UL). It may be used for transmission or in the form of a DL portion + a gap + an UL portion.
  • a short slot time-domain scheduling interval for transmitting / receiving uplink / downlink data is defined based on a mini-slot consisting of fewer symbols than the slot in an arbitrary number (numerology) (or SCS).
  • a scheduling interval may be set or a long time-domain scheduling interval for transmitting / receiving uplink / downlink data may be configured through slot aggregation.
  • latency critical data such as URLLC
  • it is based on 1ms (14 symbols) defined in a number-based numerology-based frame structure such as 15kHz.
  • a mini slot consisting of fewer OFDM symbols than the corresponding slot is defined and based on this, critical to the same delay rate as the corresponding URLLC. (latency critical) can be defined to be scheduled for the data.
  • a number of numerology having different SCS values in one NR carrier is supported for each numerology.
  • Scheduling data according to a latency requirement based on a defined slot (or mini slot) length is also considered. For example, as shown in FIG. 8 below, when the SCS is 60 kHz, since the symbol length is reduced by about 1/4 compared to the case of the SCS 15 kHz, when one slot is formed of the same 14 OFDM symbols, The slot length is 1ms, while the 60kHz-based slot length is reduced to about 0.25ms.
  • L1 control information such as DL assignment Downlink Control Information (DCI) and UL Grant DCI is transmitted and received through a PDCCH.
  • a control channel element (CCE) is defined as a resource unit for the transmission of the PDCCH, and in the NR, a control resource set (CORESET), which is a frequency / time resource for the PDCCH transmission, may be set for each terminal.
  • each CORESET may be configured with one or more search spaces consisting of one or more PDCCH candidates for monitoring the PDCCH.
  • a scalable bandwidth operation for any LTE component carrier was supported. That is, according to the frequency deployment scenario (deployment scenario) in any LTE carrier to configure a single LTE CC, a minimum bandwidth of 1.4 MHz to 20 MHz could be configured, the normal LTE terminal is one LTE For the CC, a transmit / receive capacity of 20 MHz bandwidth was supported.
  • bandwidth part (s)
  • BWP bandwidth part
  • one or more bandwidth parts may be configured through one serving cell configured from a UE perspective, and the corresponding UE may include one downlink bandwidth part in a corresponding serving cell.
  • DL bandwidth part and one uplink bandwidth part (UL bandwidth part) by activation (activation) has been defined to be used for transmitting and receiving uplink / downlink data.
  • activation activation
  • a plurality of serving cells are configured in the corresponding UE, that is, even for a UE to which a CA is applied
  • one downlink bandwidth part and / or uplink bandwidth part is activated for each serving cell.
  • the radio resources of the corresponding serving cell serving cell
  • serving cell has been defined to use for transmitting and receiving uplink / downlink data.
  • an initial bandwidth part is defined for an initial access procedure of a terminal in a serving cell, and one or more terminals are specified through dedicated RRC signaling for each terminal.
  • a specific bandwidth part (s) may be configured, and a default bandwidth part for a fallback operation may be defined for each terminal.
  • a plurality of downlink and / or uplink bandwidth parts are simultaneously activated and used according to the capability and bandwidth part (s) configuration of the terminal.
  • s capability and bandwidth part
  • only one downlink bandwidth part and one uplink bandwidth part may be activated at an arbitrary time in an arbitrary terminal in NR rel-15. .
  • the base station when the PDSCH resource allocation, corresponds to the ACK resource indicator (ARI) information region of the DL assignment DCI format (DL assignment DCI format) Indicates uplink control channel (PUCCH) resource allocation information for HARQ ACK feedback for the PDSCH.
  • the base station configures one or more PUCCH resource set configuration information consisting of one or more PUCCH resources for each uplink bandwidth part (UL BWP) configured for an arbitrary terminal through RRC signaling. Send to the terminal.
  • UL BWP uplink bandwidth part
  • the ARI is defined to indicate a PUCCH resource index for HARQ ACK feedback for a certain PDSCH, and the PUCCH resource set includes a payload size of UCI to be transmitted through a PUCCH of a corresponding slot.
  • PUCCH resources for UCI transmission such as scheduling request (SR) or channel state information (CSI) other than HARQ ACK / NACK may also be allocated through higher layer signaling, or may include downlink control information (Downlink Control Information); May be indicated via DCI).
  • SR scheduling request
  • CSI channel state information
  • DCI Downlink Control Information
  • the corresponding UCI may be multiplexed onto the PUSCH and transmitted.
  • the base station sets a specific value for UCI multiplexing, that is, an offset value ( ⁇ offset ) for determining the amount of resources to be used for UCI transmission among the allocated PUSCH transmission resources, so that the DCI or higher layer signaling (higher) is performed. layer signaling) to be transmitted to the terminal.
  • ⁇ offset an offset value
  • LAA Licensed Assisted Access
  • PUSCH transmission method defined in LTE LAA in order to minimize the PUSCH performance degradation due to additional LBT for PUSCH transmission of the UE, a multi-subframe scheduling method and a UL grant DCI and A separate PUSCH triggering method has been defined for PUSCH transmission through DCI transmission.
  • PUSCH transmission according to PUSCH triggering is a method of PUSCH transmission indication for an arbitrary UE in a base station, and allocates a PUSCH transmission resource for the UE through UE-specific UL grant DCI transmission.
  • a new PUSCH scheduling method defined for LAA which separately transmits a PUSCH triggering DCI for triggering PUSCH transmission of a UE later.
  • Type-1 uplink channel access method channel access priority is determined according to QoS of data included in a PUSCH transmitted by the UE, and LBT is performed using a given parameter value according to the priority and channel access / occupation procedure. Is performed.
  • the type-2 uplink channel access method determines whether the channel is available by only one channel sensing during the Tshort_ul period when transmitting the uplink data channel and transmits the PUSCH by occupying the channel.
  • Tshort_ul 25us used to perform LBT and the channel is sensed as “usable” during the Tshort_ul period, the channel is considered to be available and the UE occupies the corresponding channel and transmits the PUSCH.
  • the base station For PUSCH transmission, the base station indicates an uplink channel access type (UL channel access type-1 or type-2) and a channel access priority class to the terminal with UL grant information. .
  • the UE performs a channel access procedure according to an uplink channel access type that has received a corresponding indication for uplink data transmission through a PUSCH.
  • both a method of transmitting a PUSCH using a single subframe and a method of transmitting a PUSCH using a plurality of subframes may be used.
  • both TM1 and TM2 are supported as a transmission mode for PUSCH transmission.
  • DCI format 0A / DCI format 0B is used for DCI for scheduling transmission of a single subframe / multiple subframes to TM1, respectively.
  • DCI format 4A / DCI format 4B is used for DCI for scheduling transmission of a single subframe / multiple subframes to TM2, respectively.
  • the base station may flexibly indicate a transmission timing of the PUSCH from 4ms to 20ms based on the minimum delay time (ex, 4ms) when scheduling the PUSCH in the unlicensed band.
  • the base station may indicate a flexible transmission timing by adding a field called a timing offset to each uplink grant information.
  • the base station may schedule the PUSCH to the UE through two triggering types (type-A, type-B).
  • Triggering type A includes all information on PUSCH transmission in uplink grant information and indicates PUSCH transmission to the UE by including absolute PUSCH transmission timing information, which is the same as in the existing licensed band.
  • Triggering type B includes all information on PUSCH transmission in uplink grant information and transmits the information including relative PUSCH transmission timing information.
  • the timing information actually transmitted is determined by the indicator of the PUSCH trigger B transmitted when the C-PDCCH is received and 'UL duration and offset' information.
  • any operator or individual can be used to provide a wireless communication service within the regulation of each country, not a wireless channel exclusively used by any operator. Accordingly, when providing NR service through unlicensed band, co-existence problem with various short range wireless communication protocols such as WiFi, Bluetooth, NFC, etc. already provided through the unlicensed band, and also between each NR operator or LTE provider There is a need for a solution to co-existence problems.
  • the power level of a radio channel or a carrier to be used is sensed by transmitting a radio signal before transmitting a radio signal to avoid interference or collision between respective radio communication services.
  • LBT List Before Talk
  • the radio communication service through the unlicensed band is not licensed band because there is a possibility of being restricted by the provision of NR service through the band.
  • the QoS required by the user cannot be guaranteed.
  • any wideband NR-U cell is configured through an unlicensed band
  • coexistence with other RATs should be considered in order to increase an access probability for the corresponding NR-U cell.
  • the system bandwidth of any NR-U cell or DL or UL BWP configured for any terminal in the corresponding NR-U cell is divided into subbands and LBT is performed in units of the corresponding subbands.
  • FIG. 10 is a diagram illustrating a procedure for transmitting uplink data in an unlicensed band by a terminal according to an embodiment.
  • the terminal may receive configuration information of one or more subbands of a bandwidth part configured in an unlicensed band or a system bandwidth of a cell configured in an unlicensed band (S1000).
  • a bandwidth part may be configured for each UE for uplink or downlink wireless physical channel and physical signal transmission and reception for the UE.
  • the terminal may transmit and receive data by activating one bandwidth part among the configured bandwidth parts. Since the system bandwidth constituting the NR cell can be configured with a broadband of 100 MHz or more, a bandwidth of one BWP for any terminal can also be configured with a broadband of 100 MHz or more.
  • LBT is first performed to check whether the radio channel is occupied by another node. Accordingly, the base station performs an LBT for a frequency band in which a corresponding NR-U cell is configured to transmit a PDSCH for a UE in an NR-U cell in an unlicensed band, and when the corresponding frequency band is empty, the PDCCH and the corresponding PDSCH You can perform the transfer. Similarly, in order to transmit an uplink signal, the terminal must first perform LBT on the corresponding uplink radio channel.
  • the bandwidth of the DL BWP or UL BWP for any terminal in the NR-U cell may also be configured larger than 20MHz.
  • RAT radio access technology
  • one or more subbands having arbitrary bandwidths may be configured for the DL BWP or the UL BWP configured for the UE.
  • the base station or the terminal may perform LBT on a per subband basis. That is, in the present disclosure, a subband is used for uplink / downlink transmission at a base station or a terminal regardless of the system bandwidth of any NR cell configured through an unlicensed band or the bandwidth of a DL BWP or UL BWP configured for any terminal. It may mean a unit of a frequency axis through which a clear channel assessment (CCA) is performed. That is, in the present disclosure, the subband may mean an LBT bandwidth corresponding to a unit in which the LBT is performed on the frequency axis.
  • CCA clear channel assessment
  • resource allocation for the DL BWP and transmission / reception of PDCCH or PDSCH may be performed in units of corresponding subbands.
  • resource allocation for the UL BWP and transmission / reception of PUCCH or PUSCH may be performed in units of corresponding subbands.
  • the resource allocation is performed in the same manner as in the conventional DL BWP or UL BWP unit, and whether or not the actual PDSCH / PUSCH transmission and reception through the allocated resource may be determined by the LBT execution result of the subband unit.
  • the base station may divide each up / down link bandwidth part set in the terminal into a plurality of subbands.
  • the subband configuration information may be set for each bandwidth part. That is, when four bandwidth parts are configured in a terminal, the number, location, size, etc. of subbands may be configured identically or differently for each bandwidth part.
  • the subband may be configured based on a system bandwidth constituting an NR cell of the corresponding unlicensed band independently of the bandwidth part set for any terminal.
  • the subband configuration information includes at least one of the number of subbands in each bandwidth part or system bandwidth, the bandwidth of the subband, the size of the subband and the number of PRBs of the subband, and the bandwidth part identification information mapped to each subband. It can contain one piece of information.
  • the subband configuration information may be included in higher layer signaling.
  • the higher layer signaling including the subband configuration information may include LBT configuration information for each subband for performing the LBT operation in each subband.
  • higher layer signaling may include LBT configuration information including information (eg, a threshold value, etc.) required for the UE to perform LBT in each subband.
  • the LBT configuration information may include different parameters for each subband, or the same parameter may be set without distinguishing subbands.
  • the subband which is a unit of the LBT in the frequency axis may implicitly, that is, separate subband configuration information based on a system bandwidth of an NR-U cell or a bandwidth part configured for an arbitrary terminal. It may be configured according to a predetermined rule without signaling included.
  • the terminal may receive downlink control information including uplink scheduling information for uplink data transmission in a bandwidth part including one or more subbands (S1010).
  • the terminal receives uplink scheduling information from the base station to transmit uplink data in a bandwidth part including one or more subbands.
  • the bandwidth part may be composed of one or more subbands as described above.
  • the uplink scheduling information may further include subband allocation information.
  • the uplink scheduling information may include subband allocation information and subband-based frequency domain resource assignment information for frequency resource allocation for uplink data transmission.
  • the subband allocation information may be bitmap-based indication information for each subband, or may include subband ID or subband index indication information.
  • the terminal receives uplink scheduling information from the base station to transmit uplink data in the bandwidth part including one or more subbands.
  • the bandwidth part may be composed of one or more subbands as described above.
  • uplink scheduling information includes only bandwidth part-based frequency domain resource allocation information as in the past for frequency resource allocation for uplink data transmission and may not include separate subband allocation information as described above. .
  • the UE on the basis of uplink scheduling information, when the separate subband allocation information is included, the UE performs an LBT operation on each subband indicated by the subband allocation information, and performs LBT. Based on the result of the operation, a subband for transmitting uplink data may be determined (S1020), and uplink data may be transmitted in the determined subband (S1030).
  • PRBs (or VRBs) allocated in the corresponding bandwidth part by frequency domain resource allocation information for the uplink data transmission
  • An LBT operation may be performed on each subband belonging to each of the subbands, and a subband for transmitting uplink data may be determined based on the result of the LBT operation (S1020), and uplink data may be transmitted in the determined subband (S1030). .
  • the terminal performs an LBT operation on radio resources allocated to the terminal by uplink scheduling information.
  • the UE may perform an LBT operation on each of at least one subband explicitly or implicitly indicated by uplink scheduling information among one or more subbands constituting the bandwidth part.
  • the LBT operation may include an operation of sensing an energy level of a corresponding radio resource and comparing the sensed energy level with a preset reference energy level.
  • the UE may perform uplink data transmission according to uplink scheduling information.
  • the terminal may determine all the subbands as a subband for transmitting uplink data.
  • the UE may be configured to transmit uplink data only when the LBT operation is confirmed to be successful for all subbands performing the LBT operation. That is, when the uplink scheduling information includes the subband indication information, it may be defined to transmit the uplink data according to the uplink scheduling information only when the LBT operation for all the indicated subbands is confirmed as successful.
  • the uplink scheduling information does not include separate subband indication information, all of the PRBs (or VRBs) allocated for uplink data transmission belong to the frequency domain resource allocation information for uplink data transmission.
  • the terminal may define to perform uplink data transmission on some subbands in which the LBT operation is successful. That is, LBT succeeds only in some subbands among all subbands to which PRBs (or VRBs) allocated for uplink data transmission according to frequency domain resource allocation information indicated by uplink scheduling control information, and in other subbands. If the LBT fails, it may be defined to transmit an uplink data channel (PUSCH) only through allocated PRBs (or VRBs) of the corresponding LBT success subband. In this case, in the resource mapping for the data transmission block generated according to the uplink scheduling control information, the mapping for the radio resource belonging to the subband that has failed the LBT is puncturing or rate matching. Can be defined to perform.
  • PUSCH uplink data channel
  • the UE when the UE can perform uplink data transmission in two or more subbands as a result of performing an LBT operation, the UE uses the one or more subband radio resources according to the above-described subband selection rule to perform uplink data.
  • the terminal selects a subband having the lowest or highest subband index, selects a subband in which a reference signal is received, or selects a subband indicated by the base station in at least one subband selected as a result of performing the LBT operation.
  • One or more subbands may be selected according to a subband selection rule, such as a selection or a subband set as a default.
  • the present invention can provide a method and apparatus for transmitting and receiving uplink data based on LBT results of one or more subbands for a bandwidth part in an unlicensed band.
  • the UE can prevent a decrease in data transmission probability that can occur when performing LBT for a wide frequency region and can satisfy data transmission QoS using an unlicensed band.
  • 11 is a diagram illustrating a procedure of receiving uplink data in an unlicensed band by a base station according to an embodiment.
  • the base station may transmit configuration information of one or more subbands of the bandwidth part or the system bandwidth of the cell configured in the unlicensed band to the terminal (S1100).
  • the base station may configure one or more subbands each having an arbitrary bandwidth for the DL BWP or UL BWP configured for the terminal.
  • the base station or the terminal may perform LBT on a per subband basis.
  • the base station may divide the bandwidth part set in the terminal into a plurality of subbands.
  • the subband configuration information may be set for each bandwidth part.
  • the subband configuration information includes at least one of the number of subbands in each bandwidth part, the bandwidth of the subband, the size of the subband and the number of PRBs of the subband, and the bandwidth part identification information mapped to each subband. It may include.
  • the subband configuration information may be included in higher layer signaling and transmitted.
  • the higher layer signaling including the subband configuration information may include LBT configuration information for each subband for performing the LBT operation in each subband.
  • higher layer signaling may include LBT configuration information including information (eg, a threshold value, etc.) required for the UE to perform LBT in each subband.
  • the LBT configuration information may include different parameters for each subband, or the same parameter may be set without distinguishing subbands.
  • the subband which is a unit of the LBT on the frequency axis implicitly, i.e., includes subband configuration information based on a system bandwidth of an unlicensed band NR cell or a bandwidth part configured for an arbitrary terminal. It can be configured by defined rules without signaling.
  • the base station may transmit downlink control information including uplink scheduling information for uplink data transmission in a bandwidth part including one or more subbands (S1110).
  • the base station transmits uplink scheduling information to the terminal to receive uplink data in a bandwidth part including one or more subbands.
  • the bandwidth part may be composed of one or more subbands as described above.
  • the uplink scheduling information may further include subband allocation information.
  • the uplink scheduling information may include subband allocation information and subband-based frequency domain resource assignment information for frequency resource allocation for uplink data transmission.
  • the subband allocation information may be bitmap-based indication information for each subband, or may include subband ID or subband index indication information.
  • the base station transmits uplink scheduling information to the terminal for transmitting uplink data in a bandwidth part including one or more subbands.
  • the bandwidth part may be composed of one or more subbands as described above.
  • uplink scheduling information includes only bandwidth part-based frequency domain resource allocation information as in the past for frequency resource allocation for uplink data transmission and may not include separate subband allocation information as described above. .
  • the UE when the base station includes the separate subband allocation information based on uplink scheduling information, the UE performs an LBT operation on each subband indicated by the subband allocation information. Uplink data may be received in the subband determined based on the result (S1120).
  • uplink data may be received in a subband determined based on a result of the LBT operation performed by the UE (S1120).
  • the base station may receive the uplink data from the terminal through the radio resources of the subband selected by the above-described terminal operation.
  • the terminal performs an LBT operation on radio resources allocated to the terminal by uplink scheduling information.
  • the UE may perform an LBT operation on each of at least one subband explicitly or implicitly indicated by uplink scheduling information among one or more subbands constituting the bandwidth part.
  • the LBT operation may include an operation of sensing an energy level of a corresponding radio resource and comparing the sensed energy level with a preset reference energy level.
  • the UE performs uplink data transmission according to uplink scheduling information.
  • the terminal may determine all the subbands as a subband for transmitting uplink data.
  • the UE may be configured to transmit uplink data only when the LBT operation is confirmed to be successful for all subbands performing the LBT operation. That is, when subband indication information is included in the uplink scheduling information, only uplink data may be transmitted according to the uplink scheduling information when the LBT operation for all indicated subbands is confirmed to be successful. have.
  • the uplink scheduling information does not include separate subband indication information, all of the PRBs (or VRBs) allocated for uplink data transmission belong to the frequency domain resource allocation information for uplink data transmission.
  • the terminal may define to perform uplink data transmission on some subbands in which the LBT operation is successful. That is, LBT succeeds only in some subbands among all subbands to which PRBs (or VRBs) allocated for uplink data transmission according to frequency domain resource allocation information indicated by uplink scheduling control information, and in other subbands. If the LBT fails, it may be defined to transmit an uplink data channel (PUSCH) only through allocated PRBs (or VRBs) of the corresponding LBT success subband.
  • PUSCH uplink data channel
  • the mapping for the radio resource belonging to the subband in which the LBT fails may be defined to puncturing or to perform rate matching.
  • the present invention can provide a method and apparatus for transmitting and receiving uplink data based on LBT results of one or more subbands for a bandwidth part in an unlicensed band.
  • the UE can prevent a decrease in data transmission probability that can occur when performing LBT for a wide frequency region and can satisfy data transmission QoS using an unlicensed band.
  • the operations of the terminal and the base station described above have described some embodiments according to the present disclosure, and various embodiments may be performed in the corresponding operations and steps. Therefore, the following describes various embodiments in each procedure for carrying out the present invention.
  • the information in each embodiment may be included in the above-described subband configuration information, LBT configuration information, downlink control information, subband selection rule, or the like, or may be delivered to the terminal through separate signaling.
  • the LBT Listen Before Talk
  • the base station in order to transmit a PDSCH for an arbitrary UE in an NR-U cell of an unlicensed band configured by an arbitrary NR base station, the base station must perform LBT for the frequency band in which the corresponding NR-U cell is configured.
  • the base station may transmit a PDCCH and a corresponding PDSCH to the terminal.
  • the terminal in order to transmit an uplink signal, the terminal must first perform LBT on the corresponding uplink radio channel. Therefore, the UE should preferentially perform LBT upon PUSCH transmission for uplink data transmission.
  • the UE may not be able to transmit the PUSCH at the time indicated by the UL control DCI format, that is, the scheduling control information received from the base station according to the success of the LBT. That is, when the LBT fails, the PUSCH transmission by the corresponding UL grant may fail.
  • a base station sets RRC signaling or instructs a corresponding terminal through DL assignment DCI (DL assignment DCI) for HARQ ACK / NACK feedback timing for PDSCH reception of a terminal.
  • DL assignment DCI DL assignment DCI
  • PUCCH transmission including HARQ ACK / NACK feedback information may not be possible at the time indicated by the base station according to the LBT result of the terminal. That is, if LBT failure occurs when the corresponding radio channel is occupied by another node as a result of LBT, the UE cannot transmit HARQ ACK / NACK feedback information according to PDSCH at the time indicated by the base station. do. This may cause serious degradation in HARQ performance in the NR-U cell.
  • FIG 12 illustrates an example of performing LBT for wireless communication in an unlicensed band according to an embodiment.
  • the base station may indicate whether to perform LBT on the corresponding terminal.
  • the UE may transmit uplink control information (UCI) such as HARQ ACK / NACK feedback information or CQI / CSI reporting information to the base station through the PUCCH.
  • UCI uplink control information
  • a time resource and a frequency resource which are PUCCH resources for transmitting HARQ feedback, may be indicated by a base station through a DL assignment DCI.
  • the PUCCH resource for transmitting HARQ feedback may be set to semi-static through RRC signaling.
  • a timing gap value between a PDSCH reception slot and a corresponding HARQ feedback information transmission slot may be transmitted to a UE through DL assignment DCI or RRC signaling.
  • PUCCH resources for CQI / CSI reporting may also be allocated through RRC signaling and DL assignment DCI.
  • the LBT (DL LBT) for downlink transmission is successful in the base station, and it is indicated by hatching that downlink transmission is performed through the unlicensed band at a later time.
  • the downlink transmission may be a transmission of a downlink channel or a signal indicating uplink transmission.
  • a PUCCH for PDSCH transmission and a corresponding HARQ feedback, a DCI requiring CQI / CSI reporting, a PUCCH for reporting accordingly, or a DCI for transmitting scheduling information for PUSCH and a corresponding PUSCH, etc. Can be.
  • a timing gap occurs between downlink transmission and uplink transmission.
  • the UE when a downlink signal or channel according to downlink transmission indicates PUCCH transmission in an NR-U cell that is an unlicensed band, the UE basically transmits the corresponding PUCCH according to regulation of an unlicensed spectrum.
  • the LBT (UL LBT) must be performed first, and the PUCCH transmission at the indicated time is determined according to the LBT result. If, as a result of the LBT, the corresponding radio channel is occupied by another node, that is, when an LBT failure occurs, the corresponding UE may not perform PUCCH transmission at the indicated time.
  • a PDSCH transmission slot and a corresponding PUCCH transmission slot according to a DL assignment DCI transmission slot or a corresponding DL assignment DCI including a PUCCH resource allocation information and PUCCH transmission indication information are corresponding base stations. If the UE belongs to the Channel Occupancy Time (COT) of the UE, PUCCH transmission may be possible in the corresponding UE without performing LBT. This is because the base station is already occupied for downlink transmission to the corresponding UE in the unlicensed band and is not occupied by another node.
  • COT Channel Occupancy Time
  • HARQ feedback transmission through the PUCCH may be performed in the corresponding UE without LBT.
  • CSI / CQI reporting through PUCCH is instructed through DL assignment DCI
  • a slot in which DL assignment DCI is transmitted and CQI / CSI reporting accordingly If a timing gap value between slots in which PUCCH transmission including reporting information is made is M, CSI / CQI reporting through PUCCH without LBT in the corresponding UE according to the corresponding timing gap value M and the COT of the base station. This may be possible.
  • the K2 value which is timing gap information between the UL grant DCI transmitted by the base station and the slot in which the PUSCH is transmitted, is also used for the PUSCH transmission of the UE. May be set to semi-static through RRC signaling or may be set to dynamic through UL grant DCI (UL grant DCI). Even in this case, when an uplink grant DCI (UL grant DCI) transmission slot including corresponding PUSCH transmission resource allocation information and a corresponding PUSCH transmission slot belong to a COT (Channel Occupancy Time) of the base station, the UE does not perform the LBT without performing the PUB Transmission may be possible.
  • COT Channel Occupancy Time
  • the base station may instruct the terminal by setting an LBT scheme for performing LBT when PUCCH or PUSHC transmission from any terminal.
  • the LBT scheme may be divided into a plurality of schemes by at least one of whether to perform LBT, random back off, and random back off time.
  • a method of performing LBT is referred to as an 'LBT method', but is not limited thereto.
  • the manner of performing the LBT may be variously referred to as the LBT category.
  • the LBT method is a first LBT method that does not perform LBT, a second LBT method that performs LBT but does not perform random backoff, performs a random backoff with the LBT, but the random backoff time interval is fixed.
  • the third LBT scheme and the random backoff with the LBT may be performed, but the random backoff time interval may include a fourth LBT scheme and the like.
  • the base station directly indicates whether to perform LBT for uplink transmission of the terminal through L1 control signaling.
  • it may be defined to include a corresponding LBT indication information region in a DL assignment DCI format for transmitting PDSCH scheduling control information.
  • the LBT indication information may be indication information of 1 bit.
  • PUCCH transmission of a UE corresponding to a corresponding DL assignment DCI format (DL assignment DCI format) is determined according to the value (0, 1) of the corresponding bit, it may be defined to determine whether to perform LBT on the corresponding UE. have. That is, in this case, the value of the corresponding bit may mean that the first LBT scheme and the remaining LBT schemes are distinguished from the aforementioned LBT schemes.
  • the corresponding LBT indication information may be two bits of indication information.
  • the LBT scheme for performing the LBT in the terminal can be defined to be determined. That is, in this case, the value of the corresponding bit may mean that the first LBT scheme and the fourth LBT scheme are distinguished from the aforementioned LBT scheme.
  • the PUCCH transmission of the terminal corresponding to the DL assignment DCI format described above is transmitted to the HARQ feedback information of the terminal according to the PDSCH reception of the terminal based on the DL assignment DCI format. It may be a PUCCH transmission for.
  • CQI / CSI reporting is triggered by a corresponding DL assignment DCI format.
  • It may be a PUCCH transmission for CQI / CSI reporting accordingly.
  • the UL grant DCI format (UL grant DCI format) for transmitting PUSCH scheduling control information may be defined to include a corresponding LBT indication information (LBT indication information) region.
  • the LBT indication information may be indication information of 1 bit.
  • the value (0, 1) of the corresponding bit when the PUSCH transmission of the terminal corresponding to the UL grant DCI format (UL grant DCI format), it can be defined to determine whether to perform the LBT in the terminal. have. That is, in this case, the value of the corresponding bit may mean to distinguish the first scheme from the other schemes among the aforementioned LBT schemes.
  • the corresponding LBT indication information may be two bits of indication information.
  • the LBT scheme for performing the LBT in the UE can be defined to be determined. That is, in this case, the value of the corresponding bit may mean that the first to fourth schemes are distinguished from the aforementioned LBT schemes.
  • the PUSCH transmission of the terminal corresponding to the UL grant DCI format may be a PUSCH transmission for uplink data transmission of the terminal or a PUSCH transmission for UCI transmission of the terminal.
  • whether to perform the corresponding LBT is as shown in FIG. 12, downlink transmission indicated by the corresponding uplink transmission and corresponding uplink It may be defined to be determined by a timing gap value between transmissions.
  • the UE may define that the indicated PUCCH or PUSCH transmission is possible without LBT.
  • a timing gap value is larger than a corresponding threshold, it may be defined so that the UE can perform a corresponding PUCCH or PUSCH transmission after performing LBT.
  • the threshold is determined by the COT value in the corresponding NR-U, or accordingly cell-specific RRC signaling or UE-specific RRC signaling by the base station It may be configured through specific RRC signaling, or may be configured through cell-specific RRC signaling or UE-specific RRC signaling by a base station regardless of a COT.
  • the corresponding threshold is defined as a single threshold for each uplink transmission case or as a different threshold to be used for cell-specific RRC signaling by the base station. It may be configured through specific RRC signaling or UE-specific RRC signaling.
  • the LBT scheme to be performed to transmit the uplink signal in the unlicensed band can be determined, and the uplink signal can be transmitted in the unlicensed band according to the determined LBT scheme.
  • the present disclosure relates to a specific method of allocating a plurality of transmission opportunities on a frequency axis in any uplink radio channel or radio signal transmission in order to increase a transmission probability for uplink in an unlicensed band in NR. Suggest to
  • the LBT Listen Before Talk
  • the base station in order to transmit a PDSCH for an arbitrary UE in an NR-U cell of an unlicensed band configured by an arbitrary NR base station, the base station must perform LBT for the frequency band in which the corresponding NR-U cell is configured.
  • the base station may transmit the PDCCH and the corresponding PDSCH to the terminal.
  • the terminal in order to transmit an uplink signal, the terminal must first perform LBT on the corresponding uplink radio channel. Therefore, the UE should preferentially perform LBT upon PUSCH transmission for uplink data transmission.
  • the UE may not be able to transmit the PUSCH at the time indicated by the UL control DCI format, that is, the scheduling control information received from the base station according to the success of the LBT. That is, when the LBT fails, the PUSCH transmission by the corresponding UL grant may fail.
  • a bandwidth part is configured for each UE for uplink or downlink wireless physical channel and physical signal transmission and reception, and one BWP is activated and used.
  • the system bandwidth constituting the NR cell can be configured with a broadband of 100 MHz or more according to the FR (Frequency Range) in which the corresponding NR cell is configured, and thus, the bandwidth of one BWP for an arbitrary terminal is also 100 MHz or more. This is possible.
  • the DL or UL BWP for any UE is greater than 20MHz in the NR-U cell configured through an unlicensed spectrum
  • Competitiveness may be seriously degraded in terms of channel access probability compared to other RATs such as WiFi, which performs LBT in units of 20 MHz.
  • any DL or UL BWP configured for any UE is partitioned into subbands having arbitrary bandwidths to perform LBT in units of corresponding subbands, and uplink / downlink control channel and data channel.
  • the method of transmitting and receiving may be considered. That is, the BWP configured in the terminal may be composed of N subbands. Referring to FIG. 13, as an example, a 40 MHz BWP configured in a terminal is illustrated as two subbands.
  • the bandwidth of the DL BWP configured for any UE in downlink is 80MHz
  • the DL BWP is divided into four subbands having a bandwidth of 20MHz, and resource allocation in units of corresponding subbands and corresponding PDCCH or PDSCH It can be defined to enable transmission and reception.
  • uplink may be similarly defined.
  • the UL BWP bandwidth is 60 MHz
  • the UL BWP may be divided into three subbands having a bandwidth of 20 MHz, and may be defined to allow resource allocation in corresponding subband units and PUCCH or PUSCH transmission and reception accordingly.
  • a cell-specific PUSCH triggering DCI is transmitted separately from a UE-specific UL grant for resource allocation.
  • the PUSCH transmission time could be dynamically adjusted at the base station. That is, the base station allocates a PUSCH transmission resource for each terminal through a UL grant, and additionally transmits a PUSCH triggering DCI, so that the terminal can perform the PUSCH transmission according to the corresponding PUSCH transmission resource allocation information.
  • the PUSCH triggering of LTE is not configured to exceed 20MHz, for example, the bandwidth of the LAA cell is the bandwidth of the LBT unit, and for all UEs, the same resource grid-based resource is based on the system bandwidth of the corresponding cell. Since the assignment is made, there is no ambiguity due to the corresponding cell-specific PUSCH triggering.
  • different UL BWPs may be configured for each UE, and one BWP may also be configured with one or more subbands that are units of LBT. Accordingly, when PUSCH transmission by cell-specific PUSCH triggering is applied, a UE configured with different UL BWPs or a UE assigned PUSCH resources through one or more subbands may be used. There may be an ambiguity as to whether triggering is performed or whether the corresponding PUSCH triggering is valid for all subbands to which the PUSCH resource is allocated.
  • a PUSCH triggering method considering UL BWP and subband based LBT configured for each UE in the NR-U cell is proposed.
  • PUSCH transmission in the NR-U cell may be performed through one UL grant DCI format according to a scheduling method of NR configured in LTE and licensed spectrum.
  • the PUSCH transmission may be in the form of a 2-stage DCI like the PUSCH triggering method of the LTE LAA described above.
  • MCS Modulation Coding Scheme
  • HARQ number etc. for the PUSCH are made through the first UL grant DCI.
  • PUSCH transmission according to allocation of the first DCI may be indicated through the second DCI.
  • the present disclosure proposes a specific method of 2-stage DCI based PUSCH transmission for NR.
  • embodiments 1 to 3 described below may transmit the 1-stage DCI UE-specifically
  • the 2-stage DCI may be transmitted in the form of a cell-specific or UE-group common DCI.
  • Embodiment 4 can transmit both 1-stage DCI and 2-stage DCI UE-specifically.
  • Embodiment 1 Resource allocation and PUSCH triggering
  • the resource allocation is defined for each subband constituting the active UL BWP through the 1-stage UL grant DCI format, and the sub-stage through the 2-stage PUSCH triggering DCI PUSCH transmission triggering can be defined for each band.
  • Subband-based resource allocation through 1-stage DCI may be applied to all subbands configured for the UE in common, and resources transmitted through corresponding 1-stage DCI through 2-stage PUSCH triggering DCI It may be defined to indicate a subband in which PUSCH transmission is made by applying allocation information.
  • the subband-based resource allocation through 1-stage DCI may be defined to include specific subband allocation information. Accordingly, the PUSCH transmission in the corresponding UE may be defined to perform the corresponding PUSCH transmission only when the PUSCH triggering for the subband allocated through the 1-stage DCI is indicated through the 2-stage DCI.
  • the 2-stage DCI when PUSCH triggering by 2-stage DCI is performed on a subband basis, the 2-stage DCI includes subband indication information as a method for indicating a subband through which PUSCH triggering is performed through the 2-stage DCI.
  • the indication information may be bitmap indication information for each subband, or may be subband ID or subband index indication information.
  • the corresponding subband indication information may be defined to be indicated by a CRC scrambling RNTI value for the corresponding 2-stage DCI transmission. That is, the CRC scrambling RNTI value for identification of the corresponding 2-stage DCI is defined to be separately allocated for each subband, and the base station explicitly specifies the value through higher layer signaling. explicitly) or a scrambling RNTI value may be defined as a function having a UL BWP index and a subband ID (or subband index) as a parameter.
  • the corresponding PUSCH triggering is performed according to the CORESET or SS transmitted the 2-stage DCI Subbands may be defined to be determined.
  • the corresponding CORESET or SS may be defined to be configured through frequency resources of the same subband.
  • resource allocation through the 1-stage DCI is defined to include specific subband allocation information
  • a method of indicating subband allocation information through the corresponding 1-stage DCI may also be described as a sub-stage of the 2-stage DCI described above. The same method as the embodiments for indicating the band can be applied.
  • Embodiment 2 BWP-based resource allocation and subband-based PUSCH triggering
  • the PUSCH transmission resource allocation through the 1-stage UL grant DCI format is made based on the active UL BWP of the corresponding NR terminal, and the PUSCH triggering through the 2-stage DCI is a sub-constituting the corresponding UL BWP. It can be defined to be performed for each band.
  • the PUSCH resource allocation through the 1-stage UL grant DCI format uses frequency domain resource assignment information based on the PRB constituting the active UL BWP similarly to the existing DCI format 0_0 or 0_1. It may be defined to include or may be defined to additionally include one or more subband allocation information for the NR-U.
  • the 2-stage PUSCH triggering DCI may be defined such that PUSCH triggering is performed in units of subbands constituting the UL BWP as in the first embodiment.
  • the PUSCH triggering subband indication information through the 2-stage DCI may be substantially the same as described above in the first embodiment.
  • the PUSCH transmission operation in the corresponding UE may vary according to the subband in which the PUSCH triggering is performed according to the 2-stage DCI.
  • the relationship between the PUSCH resource allocated through the 1-stage DCI and the subband triggering through the 2-stage DCI is a fully-overlapping case and a partially-overlapping case on the frequency axis. ) And a non-overlapping case.
  • the PUSCH transmission operation of the UE due to the PUSCH triggering of the 2-stage DCI for each case may be defined to be different.
  • the UE may be defined to perform PUSCH transmission only for the fully-overlapping case.
  • PUSCH transmission may be defined for the fully-overlapping case and the partially-overlapping case.
  • PUSCH transmission can be defined to perform PUSCH transmission only through the corresponding overlapping frequency resource. In this case, puncturing the PUSCH transmission part for resources that are not overlapped or Alternatively, it may be defined to perform PUSCH transmission on a corresponding overlapping frequency resource through rate matching.
  • Embodiment 3 Resource allocation based on BWP and PUSCH triggering based on BWP
  • Both 1-stage UL grant DCI and 2-stage PUSCH triggering DCI may be defined so that UL BWP for a corresponding UE is performed in units. In such a case, the method for allocating resources through the 1-stage DCI may follow the second embodiment.
  • PUSCH transmission of the corresponding UE is possible for all subbands including frequency resources allocated for PUSCH transmission of an arbitrary UE through 1-stage DCI. Only in this case, the base station can be defined to perform the corresponding 2-stage PUSCH triggering.
  • the 2-stage PUSCH triggering DCI does not include separate subband indication information. Accordingly, when the UE receives the 2-stage PUSCH triggering DCI, the PUSCH transmission resource transmitted through the 1-stage DCI. It may be defined to perform PUSCH transmission according to the allocation information.
  • 1-stage DCI not only 1-stage DCI but also 2-stage DCI may be defined to transmit UE-specifically. That is, PUSCH triggering by 2-stage DCI may also be made UE-specific.
  • the information area included in the corresponding 1-stage DCI and the 2-stage DCI, a method of transmitting each DCI, and a method of transmitting a PUSCH of the UE according to the above-described methods are all possible in the above-described embodiments 1 to 3. Combination may be in the form, the detailed description thereof will be omitted.
  • the present disclosure has been described based on PUSCH resource allocation of NR-U cells, the above-described technical spirit may be substantially applied to the case of PDSCH.
  • the above-described technical idea may be substantially applied to PUSCH / PDSCH scheduling through a general NR cell configured through a licensed spectrum rather than an NR-U cell.
  • a method and an apparatus capable of transmitting and receiving uplink data and downlink data based on the LBT result of one or more subbands for a bandwidth part in an unlicensed band can be provided.
  • FIG. 14 is a diagram illustrating a procedure of receiving downlink data in an unlicensed band by a terminal according to an embodiment.
  • the terminal may receive configuration information of one or more subbands of the bandwidth part configured in the unlicensed band or the system bandwidth of the cell configured in the unlicensed band from the base station (S1400).
  • the bandwidth of the DL BWP or UL BWP for any terminal in the NR-U cell may also be configured larger than 20MHz.
  • the bandwidth of the DL BWP or UL BWP for any terminal in the NR-U cell may also be configured larger than 20MHz.
  • it when performing data transmission and reception by performing LBT on the basis of the corresponding bandwidth part, it is competitive in terms of channel access probability compared to other RAT (Radio access technology) such as WiFi, which performs LBT on a 20 MHz basis. This can be seriously degraded.
  • RAT Radio access technology
  • the base station may divide the bandwidth part set in the terminal into a plurality of subbands.
  • the subband configuration information may be set for each bandwidth part. That is, when four bandwidth parts are configured in a terminal, the number, location, size, etc. of subbands may be configured identically or differently for each bandwidth part.
  • the subband may be configured based on a system bandwidth constituting the NR cell of the corresponding unlicensed band independently of the bandwidth part set for any terminal.
  • the subband configuration information includes at least one of the number of subbands in each bandwidth part or system bandwidth, the bandwidth of the subband, the size of the subband and the number of PRBs of the subband, and the bandwidth part identification information mapped to each subband. It can contain one piece of information.
  • the terminal may receive the subband configuration information from the base station through higher layer signaling.
  • the subband which is a unit of the LBT in the frequency axis may implicitly, that is, separate subband configuration information based on a system bandwidth of an NR-U cell or a bandwidth part configured for an arbitrary terminal. It may be configured according to a predetermined rule without signaling included.
  • the terminal receives downlink control information including indication information on a subband determined for downlink transmission based on a result of the LBT operation performed by the base station among one or more subbands (S1410).
  • downlink data may be received in the determined subband.
  • the base station performs an LBT operation on radio resources allocated to the terminal in the unlicensed band in order to transmit downlink data to the terminal.
  • the base station may perform an LBT operation on each of at least one subband among one or more subbands for the bandwidth part configured in the terminal.
  • the LBT operation may include an operation of sensing an energy level of a corresponding radio resource and comparing the sensed energy level with a preset reference energy level.
  • the base station may determine a subband for transmitting downlink data according to a result of performing the LBT operation on each of at least one subband.
  • the base station may determine a subband in which the LBT operation is successful among the subbands performing the LBT operation as a subband for transmitting downlink data.
  • the terminal receives subband indication information for receiving a downlink signal in the activated bandwidth part.
  • a separate downlink control information for indicating the LBT results of the sub-band unit in the base station separately from the DL assignment DCI format including the downlink data transmission resource allocation control information cell It can be defined to transmit through -specific or UE-group common PDCCH. That is, a cell-specific or UE-group common DCI format for indicating whether LBT succeeds / fails on a subband basis is defined, and the base station is defined to be transmitted to the UE through cell-specific or UE-group common PDCCH. Can be. However, a new DCI format may be defined for a cell-specific or UE-group common DCI format for indicating whether LBT succeeds or fails in a corresponding subband, or an existing DCI format may be reused.
  • the terminal may receive the downlink data through the subbands indicated as available for transmission of the downlink data based on the received downlink control information.
  • a method and an apparatus capable of transmitting and receiving downlink data based on LBT results of one or more subbands for a bandwidth part in an unlicensed band.
  • the UE can prevent a decrease in data transmission probability that can occur when performing LBT for a wide frequency region and can satisfy data transmission QoS using an unlicensed band.
  • 15 is a diagram illustrating a procedure for transmitting downlink data in an unlicensed band by a base station according to an embodiment.
  • the base station may transmit configuration information of one or more subbands of the bandwidth part configured in the unlicensed band or the system bandwidth of the cell configured in the unlicensed band to the terminal (S1500).
  • the bandwidth of the DL BWP or UL BWP for any terminal in the NR-U cell may also be configured larger than 20MHz.
  • the bandwidth of the DL BWP or UL BWP for any terminal in the NR-U cell may also be configured larger than 20MHz.
  • it when performing data transmission and reception by performing LBT on the basis of the corresponding bandwidth part, it is competitive in terms of channel access probability compared to other RAT (Radio access technology) such as WiFi, which performs LBT on a 20 MHz basis. This can be seriously degraded.
  • RAT Radio access technology
  • the base station may divide the bandwidth part set in the terminal into a plurality of subbands.
  • the subband configuration information may be set for each bandwidth part. That is, when four bandwidth parts are configured in a terminal, the number, location, size, etc. of subbands may be configured identically or differently for each bandwidth part.
  • the subband may be configured based on a system bandwidth constituting the NR cell of the corresponding unlicensed band independently of the bandwidth part set for any terminal.
  • the subband configuration information includes at least one of the number of subbands in each bandwidth part or system bandwidth, the bandwidth of the subband, the size of the subband and the number of PRBs of the subband, and the bandwidth part identification information mapped to each subband. It can contain one piece of information.
  • the base station may transmit the subband configuration information to the terminal through higher layer signaling.
  • the subband which is a unit of the LBT in the frequency axis may implicitly, that is, separate subband configuration information based on a system bandwidth of an NR-U cell or a bandwidth part configured for an arbitrary terminal. It may be configured according to a predetermined rule without signaling included.
  • the base station may perform an LBT operation on each of one or more subbands, and determine a subband for transmitting downlink data based on the result of the LBT operation (S1510).
  • the base station performs an LBT operation on radio resources allocated to the terminal in the unlicensed band in order to transmit downlink data to the terminal.
  • the base station may perform an LBT operation on each of at least one subband among one or more subbands for the bandwidth part configured in the terminal.
  • the LBT operation may include an operation of sensing an energy level of a corresponding radio resource and comparing the sensed energy level with a preset reference energy level.
  • the base station may determine a subband for transmitting uplink data according to a result of performing the LBT operation on each of at least one subband.
  • the base station may determine a subband in which the LBT operation is successful among the subbands performing the LBT operation as a subband for transmitting downlink data.
  • the base station may transmit downlink control information including the indication information on the determined subband (S1520) and transmit downlink data in the determined subband (S1530).
  • the base station transmits downlink scheduling information to the corresponding terminal in order to transmit downlink data in the bandwidth part activated for the terminal.
  • the bandwidth part may be composed of one or more subbands as described above, downlink scheduling information for one or more subbands may be received through one downlink control information.
  • the downlink control information may include at least one of frequency domain resource allocation information such as bandwidth part indication information and subband indication information used for transmission of downlink data and time domain resource allocation information for downlink data transmission.
  • the subband indication information indicating a subband that can be used for reception of downlink data in which the LBT operation is confirmed as successful is a cell-specific downlink control channel (cell-specific PDCCH) or a group. It may be transmitted through a common downlink control channel (group-common PDCCH).
  • the base station may transmit the downlink data through the subbands indicated as available for transmission of the downlink data based on the transmitted downlink control information.
  • the present invention can provide a method and apparatus for transmitting and receiving uplink data based on LBT results of one or more subbands for a bandwidth part in an unlicensed band.
  • the UE can prevent a decrease in data transmission probability that can occur when performing LBT for a wide frequency region and can satisfy data transmission QoS using an unlicensed band.
  • 16 is a diagram illustrating a configuration of a user terminal 1600 according to another embodiment.
  • a user terminal 1600 includes a controller 1610, a transmitter 1620, and a receiver 1630.
  • the controller 1610 controls the overall operation of the user terminal 1600 according to a method of transmitting and receiving uplink data and downlink data in an unlicensed band required to perform the above-described present disclosure.
  • the transmitter 1620 transmits uplink control information, data, and a message to a base station through a corresponding channel.
  • the receiver 1630 receives downlink control information, data, and a message from a base station through a corresponding channel.
  • the receiver 1630 may receive configuration information of one or more subbands about a bandwidth part configured in the unlicensed band or a system bandwidth of a cell configured in the unlicensed band.
  • the base station may divide the bandwidth part set in the terminal into one or more subbands.
  • the subband configuration information may be set for each bandwidth part.
  • the number, location, size, etc. of subbands may be configured to be the same or different for each bandwidth part.
  • the subband configuration information includes at least one of the number of subbands in each bandwidth part or system bandwidth, the bandwidth of the subband, the size of the subband and the number of PRBs of the subband, and the bandwidth part identification information mapped to each subband. It can contain one piece of information.
  • the receiver 1630 may receive subband configuration information through higher layer signaling.
  • the higher layer signaling including the subband configuration information may include LBT configuration information for each subband for performing the LBT operation in each subband.
  • higher layer signaling may include LBT configuration information including information (eg, a threshold value, etc.) required for the UE to perform LBT in each subband.
  • the LBT configuration information may include different parameters for each subband, or the same parameter may be set without distinguishing subbands.
  • the subband which is a unit of the LBT on the frequency axis implicitly, i.e., includes subband configuration information based on a system bandwidth of an NR-U cell or a bandwidth part configured for an arbitrary terminal. It can be configured according to a certain rule without signaling.
  • the receiver 1630 may receive downlink control information including uplink scheduling information for one or more subbands.
  • the receiver 1630 may receive uplink scheduling information from the base station in order to transmit uplink data in the activated bandwidth part.
  • uplink scheduling information for one or more subbands may be received through one downlink control information.
  • the downlink control information includes subband indication information indicating one or more subbands for LBT operation, bandwidth part indication information indicating a bandwidth part including one or more subbands for LBT operation, and uplink data transmission. It may include at least one information of the frequency domain resource allocation information for the time domain resource allocation information for uplink data transmission.
  • the subband indication information may be bitmap indication information for each subband, or may be subband ID or subband index indication information.
  • the controller 1610 may perform an LBT operation on each of at least one subband based on uplink scheduling information.
  • the controller 1610 may determine a subband for transmitting uplink data based on the result of the LBT operation.
  • the transmitter 1620 may transmit uplink data in the determined subband.
  • the controller 1610 performs an LBT operation on a radio resource allocated to the terminal by uplink scheduling information.
  • the controller 1610 may perform an LBT operation on each of at least one subband indicated by uplink scheduling information among one or more subbands constituting the bandwidth part.
  • the LBT operation may include an operation of sensing an energy level of a corresponding radio resource and comparing the sensed energy level with a preset reference energy level.
  • the controller 1610 may determine a subband to transmit uplink data based on an energy level value for each subband and a subband selection rule measured as a result of performing the LBT operation.
  • the subband selection rule may be indicated by the base station or preset in the terminal.
  • the subband selection rule may be set based on at least one of subband index information, reference signal reception information for each subband, base station indication information, and default subband presence information.
  • the controller 1610 may determine a subband for transmitting uplink data according to a result of performing an LBT operation on each of at least one subband indicated by uplink scheduling information.
  • the controller 1610 may determine all of the subbands as subbands for transmitting uplink data. In this case, the controller 1610 may control the transmitter 1620 to transmit uplink data only when the LBT operation is confirmed to be successful for all subbands performing the LBT operation.
  • the transmitter 1620 uses the one or more subband radio resources according to the above-described subband selection rule.
  • Link data can be transmitted.
  • the controller 1610 may select a subband having the lowest or highest subband index in the one or more subbands selected as a result of performing the LBT operation, select a subband in which a reference signal is received, or be indicated by the base station.
  • One or more subbands may be selected according to a subband selection rule, such as selecting a subband or selecting a subband set as a default.
  • the receiver 1630 may receive downlink control information including subband indication information determined based on a result of the LBT operation performed by the base station among one or more subbands.
  • the receiver 1630 may receive downlink data in the determined subband.
  • the base station performs an LBT operation on radio resources allocated to the terminal in the unlicensed band in order to transmit downlink data to the terminal.
  • the base station may perform an LBT operation on each of at least one subband among one or more subbands for the bandwidth part configured in the terminal.
  • the base station may determine a subband for transmitting uplink data according to a result of performing the LBT operation on each of at least one subband.
  • the base station may determine a subband in which the LBT operation is successful among the subbands performing the LBT operation as a subband for transmitting downlink data.
  • the receiver 1630 receives downlink scheduling information from the base station in order to receive downlink data in the activated bandwidth part.
  • the downlink control information may include at least one of frequency domain resource allocation information such as bandwidth part indication information and subband indication information used for transmission of downlink data and time domain resource allocation information for downlink data transmission.
  • the receiver 1630 may use the cell-specific downlink control channel (cell-specific PDCCH) or group common downlink to provide subband indication information indicating a subband that may be used for receiving downlink data. It can be received through a control channel (group-common PDCCH).
  • the receiver 1630 may receive downlink data through a subband indicated as available for transmission of downlink data based on the received downlink control information.
  • the present invention can provide a method and apparatus for transmitting and receiving uplink data based on LBT results of one or more subbands for a bandwidth part or a system bandwidth in an unlicensed band.
  • the UE can prevent a decrease in data transmission probability that can occur when performing LBT for a wide frequency region and can satisfy data transmission QoS using an unlicensed band.
  • FIG. 17 is a diagram illustrating a configuration of a base station 1700 according to another embodiment.
  • a base station 1700 includes a controller 1710, a transmitter 1720, and a receiver 1730.
  • the controller 1710 controls the overall operation of the base station 1700 according to the method for receiving uplink control information in the unlicensed band required to perform the above-described present disclosure.
  • the transmitter 1720 and the receiver 1730 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described disclosure.
  • the transmitter 1720 may transmit configuration information of one or more subbands of the bandwidth part configured in the unlicensed band or the system bandwidth of the cell configured in the unlicensed band to the terminal.
  • the controller 1710 may divide the system bandwidth of the cell configured in the bandwidth part or the unlicensed band set in the UE into one or more subbands.
  • the subband configuration information may be set for each bandwidth part.
  • the number, location, size, etc. of subbands may be configured to be the same or different for each bandwidth part.
  • the subband configuration information includes at least one of the number of subbands in each bandwidth part, the bandwidth of the subband, the size of the subband and the number of PRBs of the subband, and the bandwidth part identification information mapped to each subband. It may include.
  • the transmitter 1720 may transmit the subband configuration information through higher layer signaling.
  • the higher layer signaling including the subband configuration information may include LBT configuration information for each subband for performing the LBT operation in each subband.
  • higher layer signaling may include LBT configuration information including information (eg, a threshold value, etc.) required for the UE to perform LBT in each subband.
  • the LBT configuration information may include different parameters for each subband, or the same parameter may be set without distinguishing subbands.
  • the transmitter 1720 may transmit downlink control information including uplink scheduling information about one or more subbands.
  • the transmitter 1720 may transmit uplink scheduling information to the terminal in order to receive uplink data in the activated bandwidth part.
  • uplink scheduling information for one or more subbands may be transmitted through one downlink control information.
  • the downlink control information includes subband indication information indicating one or more subbands for LBT operation, bandwidth part indication information indicating a bandwidth part including one or more subbands for LBT operation, and uplink data transmission. It may include at least one information of the frequency domain resource allocation information for the time domain resource allocation information for uplink data transmission.
  • the subband indication information may be bitmap based indication information for each subband, or may be subband ID or subband index indication information.
  • the receiver 1730 may receive uplink data in a subband determined based on a result of the LBT operation of the at least one subband in each bandwidth part.
  • the reception unit 1730 may receive the uplink data from the terminal through the radio resources of the subband selected by the above-described operation of the terminal.
  • the terminal performs an LBT operation on radio resources allocated to the terminal by uplink scheduling information.
  • the UE may perform an LBT operation on each of at least one subband indicated by uplink scheduling information among one or more subbands constituting a bandwidth part or a system bandwidth.
  • the LBT operation may include an operation of sensing an energy level of a corresponding radio resource and comparing the sensed energy level with a preset reference energy level.
  • the UE may determine a subband to transmit uplink data based on an energy level value for each subband and a subband selection rule measured as a result of performing the LBT operation.
  • the subband selection rule may be indicated by the base station or preset in the terminal.
  • the subband selection rule may be set based on at least one of subband index information, reference signal reception information for each subband, base station indication information, and default subband presence information.
  • the terminal may determine a subband for transmitting uplink data according to a result of performing an LBT operation on each of at least one subband indicated by uplink scheduling information.
  • the terminal may determine all the subbands as a subband for transmitting uplink data.
  • the UE may be configured to transmit uplink data only when the LBT operation is confirmed to be successful for all subbands performing the LBT operation.
  • the receiver 1730 may receive uplink data through all of the subbands in which the LBT operation performed by the terminal is confirmed to be successful.
  • the controller 1710 may perform an LBT operation on each of one or more subbands, and determine a subband for transmitting downlink data based on the result of the LBT operation.
  • the controller 1710 performs an LBT operation on radio resources allocated to the terminal in the unlicensed band in order to transmit downlink data to the terminal.
  • the controller 1710 may perform an LBT operation on each of at least one subband among one or more subbands for the bandwidth part configured in the terminal.
  • the LBT operation may include an operation of sensing an energy level of a corresponding radio resource and comparing the sensed energy level with a preset reference energy level.
  • the controller 1710 may determine a subband for transmitting uplink data according to a result of performing an LBT operation on each of at least one subband.
  • the controller 1710 may determine a subband in which the LBT operation is successful among the subbands performing the LBT operation as a subband for transmitting downlink data.
  • the transmitter 1720 may transmit downlink control information including downlink scheduling information about the determined subband, and may transmit downlink data in the determined subband.
  • the transmitter 1720 transmits downlink scheduling information to the corresponding terminal in order to transmit downlink data in the bandwidth part activated for the terminal.
  • the bandwidth part may be composed of one or more subbands as described above, downlink scheduling information for one or more subbands may be received through one downlink control information.
  • the downlink control information may include at least one of frequency domain resource allocation information such as bandwidth part indication information and subband indication information used for transmission of downlink data and time domain resource allocation information for downlink data transmission.
  • the subband indication information indicating a subband that can be used for reception of downlink data in which the LBT operation is confirmed as successful is a cell-specific downlink control channel (cell-specific PDCCH) or a group. It may be transmitted through a common downlink control channel (group-common PDCCH).
  • the transmitter 1720 may transmit downlink data through a subband indicated as available for transmission of downlink data based on the transmitted downlink control information.
  • the present invention can provide a method and apparatus for transmitting and receiving uplink data based on LBT results of one or more subbands for a bandwidth part in an unlicensed band.
  • the UE can prevent a decrease in data transmission probability that can occur when performing LBT for a wide frequency region and can satisfy data transmission QoS using an unlicensed band.
  • the above-described embodiments may be implemented through various means.
  • the embodiments may be implemented by hardware, firmware, software, or a combination thereof.
  • the method according to the embodiments may include one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), FPGAs. (Field Programmable Gate Arrays), a processor, a controller, a microcontroller or a microprocessor may be implemented.
  • ASICs Application Specific Integrated Circuits
  • DSPs Digital Signal Processors
  • DSPDs Digital Signal Processing Devices
  • PLDs Programmable Logic Devices
  • FPGAs Field Programmable Gate Arrays
  • a processor a controller, a microcontroller or a microprocessor may be implemented.
  • the method according to the embodiments may be implemented in the form of an apparatus, procedure, or function for performing the functions or operations described above.
  • the software code may be stored in a memory unit and driven by a processor.
  • the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
  • system generally refer to computer-related entity hardware, hardware and software. May mean a combination of, software or running software.
  • the aforementioned components may be, but are not limited to, a process driven by a processor, a processor, a controller, a control processor, an object, an execution thread, a program, and / or a computer.
  • an application running on a controller or processor and a controller or processor can be components.
  • One or more components may be within a process and / or thread of execution, and the components may be located on one device (eg, system, computing device, etc.) or distributed across two or more devices.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne, dans des modes de réalisation, un procédé et un appareil d'émission ou de réception de données dans une bande sans licence et, dans un mode de réalisation, un procédé comprenant les étapes consistant à : recevoir des informations de configuration d'au moins une sous-bande relative à une bande passante de système cellulaire comprise dans une bande sans licence ou une partie de bande passante comprise dans une bande sans licence; recevoir des informations de commande de liaison descendante comprenant des informations d'attribution de ressources de domaine de fréquence de liaison montante pour une transmission de données en liaison montante dans la partie de bande passante ou la bande passante de système; sur la base des informations d'attribution de ressources, effectuer une opération LBT sur chacune des sous-bandes comprenant des ressources de fréquence attribuées à la transmission en données de liaison montante; et sur la base du résultat de l'opération LBT, déterminer une sous-bande pour transmettre des données en liaison montante; et transmettre les données en liaison montante dans la sous-bande déterminée.
PCT/KR2019/010061 2018-08-10 2019-08-09 Procédé et appareil d'émission ou de réception de données dans une bande sans licence Ceased WO2020032675A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US17/051,611 US11445542B2 (en) 2018-08-10 2019-08-09 Method and apparatus for transmitting or receiving data in unlicensed band
CN201980029295.6A CN112088561B (zh) 2018-08-10 2019-08-09 在非许可频段中发送或接收数据的方法和设备
EP19847867.9A EP3836708B1 (fr) 2018-08-10 2019-08-09 Procédé et appareil d'émission de données dans une bande sans licence

Applications Claiming Priority (4)

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KR20180093928 2018-08-10
KR10-2018-0093928 2018-08-10
KR10-2019-0096457 2019-08-08
KR1020190096457A KR102408453B1 (ko) 2018-08-10 2019-08-08 비면허 대역에서 데이터를 송수신하는 방법 및 장치

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CN114710835A (zh) * 2022-04-13 2022-07-05 中国科学院上海微系统与信息技术研究所 一种卫星通信系统中的上行链路资源分配方法
CN115299163A (zh) * 2022-06-30 2022-11-04 北京小米移动软件有限公司 资源确定、多载波调度方法及装置、存储介质

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